Japan Geoscience Union Meeting 2015

Presentation information


Symbol H (Human Geosciences) » H-DS Disaster geosciences

[H-DS27] Tsunami and Tsunami Forecast

Wed. May 27, 2015 11:00 AM - 12:45 PM A04 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Yutaka Hayashi(Meteorological Research Institute), Yuichi Namegaya(Institute of Earthquake and Volcano Geology, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology), Chair:Yusuke Oishi(Fujitsu Laboratories Ltd.)

12:27 PM - 12:30 PM

[HDS27-P07] Estimation of tsunami propagation paths using the array analysis of tsunami simulation results

3-min talk in an oral session

*Kenji NAKATA1, Kazuki MIYAOKA1, Akio KATSUMATA1 (1.Meteorological Research Institute, JMA)

Keywords:tsunami simulation, backward ray analysis, maximum wave, array analysis, propagation path, distant tsunami

A maximum wave often arrives several hours after a first wave in case of a distant tsunami.
Therefore, it is considered to be important to prepare to monitor the maximum tsunami wave, knowing its propagation path.

The purpose of this study is to show the tsunami propagation path in a single figure.

Simulated tsunami waveform data are regarded as waveform data of an array observation.
An incoming wave direction for a reference point are determined, estimating semblance values (Neidell and Taner, 1971).
Going back toward the direction of the incoming wave from the reference point.
This process is done repeatedly until the ray reach the tsunami source.
It is a kind of a backward ray analysis.

This methodology was applied to the 2010 Chile earthquake.
The various backward propagation paths from a NOAA DART station near Japan are displayed in a single figure.
It shows that the each wave in the observed waveform at a DART station is associated with the those propagation paths and the waveform is derived from them.